<!DOCTYPE html>
<html>
<head>
    <title>Website Monitor</title>
    <style>
        body { font-family: Arial, sans-serif; }
        .site { margin-bottom: 10px; }
    </style>
</head>
<body>
<h1>Website Monitor</h1>
<div id="sites"></div>
<input type="text" id="newSite" placeholder="Website URL">
<input type="text" id="newMessage" placeholder="Message">
<button id="addSite">Add</button>
<script src="popup.js"></script>
</body>
</html>